Air cleaner



July 28, 1931. L 1,816Q633 AIR CLEANER Filed NOV. 9, 1927 I I/ I I i I l v N- lliiililil 6 INVENTOR.

A TTORNEY.

Patented July 28, 1931 UNITED STATES PATENT OFFICE Anrnun a. BULL, or na'raorr, nrcarem, assrenon "r nanny CLEANER conrom'rron'. or nn'rnorr, nrcnrem, a coaroaa'rron or MICHIGAN m summer.

Application filed November 9, 1927. Serial No. 282,010.

This invention relates to air cleaners. In my prior ap lication, No. 26,860 have de scribed and broadly claimed an air cleaner which works on the principle of utiliz n a helical current of air for separating and scharging. the solid matter through a com-- paratively restricted orifice directly to the atmosphere.

The present invention relates to an 1m- .0 provement onthis type of cleaner in which the standpipe utilized in the cleaner is very materiall' enlarged between'the outer and inner en for the purpose of cutting down the restriction to the flow of air through the .6 carburetor; for the pu ose of eliminating noise in the cleaner; an for the purpose of increasing the velocity of the swirhng air currents to more effectively eject the solid matter to the atmosphere.

:0 Fig. 1 is a vertical section ofmy 1mproved air cleaner.

Fig. 2 is an enlarged detail of one corner of the cleaner showing the baflie and discharge port.

Fig. 3 is a section taken on the line 3-3 of i 4 is a bottom view of the same. a designates the cylindrical shell of the cleaner. Over this fits a cap 6 which has a l0 folded flange b which folds over the outwardly flared end of the cylindrical shell a thereby clamping this cap in position. TlllS cap is sheared to provide the helical vanes a,

and is pressed up at the center to form the 5 dome (1.

These vanes 0 direct the air current in a centrifugal whirl, the current being directed not only outwardly but downwardly. This builds up a slight pressure or inertia at the bottom of the shell which is capable of discharging the solid matter through a very restricted orifice directly to the atmosphere. If the orifice be at all large this will not be 5 possible, as the air sucked through such an orifice will more than counter balance the small force tending to eject the solids. This much of the construction is old and is shown and claimed in my prior application, except 0 that the cap constructed by shearing a single piece of sheet metal is not shown in such prior ap lication.

n my prior application I utilize a cylindrical standpipe to cause the air to turn in its path to the carburetor, and I prefer to utilize also a baflleor trap at the bottom of the shell to prevent the solids from being drawn back over the top of the standpipe.

In my present construction I find it unnecessary to utilize the trap and in place of the cylindrical standpipe I utilize a standpipe and outlet conduit which form a double cone, but which in principle simply requires an enlargement of the pipe between the extremities for the purpose of limiting the restriction.

I find that one of the complaints about air cleaners having standpipes is that such standpipe tends to'restrict the air input into the carburetor by reason of causin the air to flow through a considerable lengt of conduit before it enters directly into the carburetor, and thereby in a measure interferes with the input into the engine. Furthermore, the c lindrical standpipe in some cases sets up 0 jectionable noises, a condition which it is rather difiicult to explain.

I have found that by enlarging the standpipe between the extremities, some very useful functional features are added to the air cleaner. One of the chief ones is that by reason of enlargin the passageway, the restriction and inter erences to a free flow of the air into the carburetor is considerably cut down, hence the volume of air flowing into the carburetor is not materially inter- 'fered with by the use of the cleaner. At the same time the objectionable noise which appearsv in some of these installations is much minimized or eliminated.

A further very important achievement is that this flaring of the standpipe from the top toward the bottom gradually restricts the passageway for that portion of the Whirl,

very

ing current, which bears the separated solids. v

The consequence is that in accordance with well understood principles this increases the velocity of the air stream forced out through the small orifice e. This very much increases the ejection eificiency of the cleaner.

I find that with this construction it is not necessary to use a tra or baflle as the ejectin efiiclency of the c eaner is such that the ba e can be eliminated, thereby very much cheapening the structure.

The lower end of the cleaner is provided with a clampin ring 70, together with the bolt and nut m y which the cleaner may be clamped over the carburetor intake pipe.

Another feature of construction is the lockseam n formed by means of the stamping that formsthe bottom of the cleaner. This stamping is clamped over the turned out or flared flanges o and p of the shell a and the standpipe m, respectively. This makes a very cheap and effective assembly, and holds the parts in place.

What I claim is: 1. In an air cleaner, the comblnatlon of a shell provided near one end with a relatively small discharge port leading directly to the atmosphere, means at the opposite endfor giving the air a whirling and helical direc-I tion toward the discharge end to thereby build up a relatively small pressure or energy to discharge the solids out of the relatively small port, and a stand pipe at the discharge end of the cleaner having a substantial enlargement between its ends, said enlargement forming a baflle at the discharge end of'the cleaner adjacent said discharge port and also cutting down the cleaner in the form of a conical enlargement flaring outwardly toward the bottom of the cleaner from the inlet end of the conduit.

3. In an air cleaner, the combination of a shell provided adjacent one end with a relatively small discharge port leading directly to the atmosphere, means at the opposite end for giving the air a. whirling and helical direction toward the discharge end to thereby build up a relatively small pressure or energy to discharge the solids out of the relatively ath of the swirling current bearing the so 'ds for the purpose of intively small discharge port leading directly to the atmosphere, meansat the op osite end 1 for giving the air a whirling and elical direction toward the discharge end to thereby build up a relatively small pressure or energy fle, vanes located in the inlet end of the shell for giving the air a swirling helical motion to discharge the solids by the pressure or energy built up directly through the restricted orifice'to the atmosphere, and an outlet conduit having an outwardly flared inlet forming a bafile at the discharge end of the cleaner adjacent the said discharge orifice.

6. In an air cleaner, the comblnation of a shell having at one end a flared out flange, a discharge orifice adjacent the flange, a conical standpipe having at its lower end a flared out flange arranged to match against the aforesaid flared out flange and a bottom wall having a turned over edge adapted to clamp over the flared out flanges to form a lock seam for locking the parts together, said bottom wall forming a continuation of said stand- In an air cleaner, the combination of a shell, a standpipe in one end of the'shell, a bottom wall secured to the end of the shell and having a ipe-like portion forming a continuation of t e standpipe and means carried on said pipe-like portion for attaching the cleaner to a carburetor intake.

8. In an air cleaner, the combination of a shell, a relatively small discharge port posi: tioned adjacent one end and leading directly to the atmosphere, an integral inlet cap having downwardly sheared vanes and an upwardly formed dome secured to the other end of the shell, and a conical member forming a combined bafile and end for the discharge end of the shell.

Intestimony whereof I aflix my signature.

, ARTHUR A. BULL.

small port, and a combined baflle and standpipe at the discharge end of the cleaner halving a double cone enlargement intermediate its ends for the purpose specified, the intersection of the double cone being substantially in a plane with the discharge end of the cleaner.

4. In an air cleaner, the combination of a shell provided adjacent one end with a relaadually cuttin down. 

